[keycloak-user] Accessing RelayState in login.ftl?

Hi, Is it possible to access the Saml RelayState information in the login.ftl? I would like to pass forward information to allow pre-filling fields in login.ftl (I have customized the login to add more than just user/pass). Since SAML is redirect based query parameters will not work and it seems RelayState might be the correct approach here but i cant figure out how i would get at it in the login.ftl. IF RelayState is not the correct mechanism is there another approach for passing info from the client to the login form? Thanks Jeff